The totally nonnegative Grassmannian is a ball

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The totally nonnegative Grassmannian is a ball

Galashin, Pavel; Karp, Steven N.; Lam, Thomas

Advances in mathematics (New York. 1965), 03/2022, Volume: 397

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We prove that three spaces of importance in topological combinatorics are homeomorphic to closed balls: the totally nonnegative Grassmannian, the compactification of the space of electrical networks, and the cyclically symmetric amplituhedron.

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Galashin, Pavel | Karp, Steven N. | Lam, Thomas

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